The Average Weight and Height of a 7-Month-Old Boy

Teenage girl holding baby boy, close up
Mother holding a baby boy while lying down. (Image: altrendo images/Stockbyte/Getty Images)

The weight and height of a 7-month-old boy depend primarily on his birth weight. Babies grow and develop at different rates, and what’s normal for one may be cause for concern in another. The U.S. Centers for Disease Control and Prevention develop growth charts that health professionals use to help monitor your infant’s growth.

About Growth Charts

During well-baby visits, your child's pediatrician records your baby’s height and weight, then tracks these measurements on standard growth charts developed by the CDC. The growth charts give typical height and weight according to age and sex. By the time your baby boy is 7 months old, his charted measurements should show his particular pattern of growth. Comparing this pattern to the standard CDC charts helps your doctor determine what is normal for your baby.

Weight

During the first 6 months of life, an infant typically gains about 5 to 7 ounces per week. From 6 to 12 months of age, expect your baby to gain 3 to 5 ounces per week. Most babies double their birth weight by 5 or 6 months of age and weigh about 2 1/2 times their birth weight by the time they are 8 months old. According to the CDC growth charts published in 2000, a 7-month-old boy typically weighs approximately 16 to 21 pounds.

Height

During your baby's first 6 months, expect him to grow about 1/2 to 1 inch each month. From 6 to 12 months, he should grow about 3/8 inch each month. Typical height for a 7-month-old boy, according to the 2000 CDC charts, is approximately 26 to 28 inches.

Considerations

It’s important to keep in mind that these weights and measurements are general guidelines. According to the American Academy of Pediatrics -- on their HealthyChildren.org website -- your baby’s rate of growth is more important than his exact weight and height at any given age. For example, an abrupt change in your baby’s established growth pattern is more cause for concern than a variation from the typical weight and height for a given age. Use these guidelines to get a general idea of what your 7-month-old boy's weight and height should be and discuss any concerns with your baby’s doctor.

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